Java Array Split splitOrderByFirst(byte[] pattern, byte[] src, int offset)

Description

split Order By First

License

Apache License

Declaration

public static byte[] splitOrderByFirst(byte[] pattern, byte[] src, int offset) 

Method Source Code

//package com.java2s;
/*//  w  w w .  j av  a  2 s. com
 * Copyright [2017] [$author]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.util.Arrays;

public class Main {
    public static byte[] splitOrderByFirst(byte[] pattern, byte[] src, int offset) {
        byte[] result;
        int match = firstMatch(pattern, src, offset);

        if (match < 0) {
            result = null;
        } else {
            if (match > 0) {
                result = Arrays.copyOfRange(src, offset, match);
            } else {
                result = new byte[0];
            }
        }

        return result;
    }

    /**
     * @param pattern
     * @param src
     * @param offset
     * @return
     */
    public static int firstMatch(byte[] pattern, byte[] src, int offset) {
        for (int i = 0; i < src.length; i++) {
            int pos = i + offset;
            if (isMatch(pattern, src, pos)) {
                return pos;
            }
        }
        return -1;
    }

    /**
     * @param pattern
     * @param src
     * @param offset
     * @return
     */
    public static boolean isMatch(byte[] pattern, byte[] src, int offset) {
        int distance = src.length - pattern.length - offset;
        if (distance < 0)
            return false;

        for (int i = 0; i < pattern.length; i++) {
            if (pattern[i] != src[i + offset])
                return false;
        }

        return true;
    }
}

Related

1. splitArray(T[] elementArray, int maxSubArraySize)
2. splitByByteSequenceSeparator(String theString, byte[] separatorByteSequence)
3. splitByteArray(byte[] array, int each)
4. splitByteArray(byte[] inByteArray, int length)
5. splitData(String[] sData, int numMaps)
6. splitSentences(String[] sentence, int limitLength, String reg)
7. splitStringOnFields(String in, int[] cuts)
8. splitWordsL(String s, boolean splitOnWs, char[] delimiters)
9. unsplit(String[] array, String seperator)